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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1b12ebad9f4ab4d66f71fe920c6e51a7220acab49969db8dfa7ae578ec32e6' 
  AND token = 'r8D4bZ/B8ndrMzAUkilGYv5GrXV4GDyZ9AyqJlorOcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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