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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8587a8a1c11b795c7ced0879bd04d7c47b2b9643b76b2ebd14b1863135e4b8' 
  AND token = 'g5Vl2k2R5fo8J8xJpRmTWWaLS1ljRGtuohUN0oAZkwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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