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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf76120a3df1ecc8e498168cc1872d71235f670d5926d1053554c76f8d0bfe57' 
  AND token = 'bBf+QopX0pBzSZAz7hYMe10B6xTxkpk+bFryfdAj9B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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