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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b674e0690fecfa7b397e2cfc634711efda787220e237866e59a615a570e3df7e' 
  AND token = 'Wx3ma15wYGXe5EsS/QWUIrtYXjW69V8tVUEI7x7CgRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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