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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9000f2e3634c1a1cfac1e94170c1556353af5f47e1ac5dc3021cf50cbe3ced3b' 
  AND token = 'ycl+SPJOhkU4qMWZ2IZ/Bl+9rQNYyHRHZqW4XhvaKOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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