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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc236808830c6770dfdbb42666af28cd88dd1db4142b6ef46d4093a9b2ee187b' 
  AND token = '+AUIpM2np5pQ3UI0X0owvFa9tk7tS52f7zJtpkhQbwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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