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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59093bbe7730b6fcbbb2f4fbbdd7b37bfca36ff7830ef25fb0cd9620e0e7073e' 
  AND token = 'zHD9vtUo1LrSZOG4uGiJDzJL7AfAUK1U+A++UiiKMR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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