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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de7a0f139ecab3512c48792de86fd54d895209552d291e04e84c5700768244c' 
  AND token = 'tQ7RXGvhIVYvo60jGQVK583ZaGS7VK+xeG0+kVeS70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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