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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5216c5664ad1006d8e53f438b8d8806f3c2c66efedf4bb27a39c6af1c04d77e6' 
  AND token = 'G5dQ5Y1b0SfBuBmHFFinXmx00JG3fgOEUbZK1lIAflU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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