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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1edd02af66552f43ff9583c6da6a513eb84225c177bf38bf494a90b54d9e7ac' 
  AND token = 'zQfPd+aCI8m+mt2uT7wuUCpUebqzfs4K+nUzLww+VS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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