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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eefbd2fd2f43fb91a56906d0a4348adc779f8058b500970f71fa9b0e927b850' 
  AND token = 'qHUxyL84rUXFEvG28k/BrEh5iaGJP459syqTw3zhTi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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