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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386b0308439ee7290486b71ff5123f5999e6c87a7582ce679ccc9113eace45c2' 
  AND token = '/mumkRCLf4KHZYmtoOMuVmE+9mMiVKHqEsH2qpyc3Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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