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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd611cbef45e4f50c6eb53c4b99b70b526b9ffcfc4d8929db4d6b77e69a747da6' 
  AND token = 'oDtkEbM9R8TVTmFYX57xYjHGKD07EjKk7PKoe/4MJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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