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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e555b0d4435c3eb43308cd13bc9eb121400fbc44aaaf95ef9696459f6d26b190' 
  AND token = 'uufU/5S675ZVsa9pwIx3gnUR74mEFl5ldSGFjTXcxKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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