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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8d55a01c7c01c86682390ff0613c2905130e0161fb9653922c307feb5e7664' 
  AND token = 'tqBvLc5M5p2/b+wRNN/RZKewSMA7b65/QRs0PGckZsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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