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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e319d2a93a31ed39b6d77a0f0d5e8f2af1fdb190474bf1594a9c692bb97653' 
  AND token = 'enEvKiajrWEhaKcFaqsf+P5OArRa/wOxk37C8Bbuvps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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