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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dd96f428d2c915e0f0e968533ff2fb6ce8ef9dd49a1062142bd17694c41ce5' 
  AND token = '8m8QBpECF/4U+7q4HpBTQdHlbIegXaOKoAtGpe6GDbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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