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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235e41ab6ec26ae42c0b9c7edfb4f45fa33794b12562620aabb4fc6dcb2bc4ad' 
  AND token = 'PTv06AJ77kUaUP5vGcykGhWF45NgaMo041Vw+NPy6tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}