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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f778871104640603cf95b8a9910244668c4515a904c1e41fbe524e4b894b37' 
  AND token = '4mpv9q7HFT8F11t3NXAdEp6Xsehg2ld7GVakcKkE+f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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