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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a408d3b1f301238b2f53b2189642d6e3d9a41ca6f456d522c0acb79d7ebee74d' 
  AND token = 'dwKEQ4TTzHPpdbNj0IZxSx8TyCCUfh91flpW09Wt16c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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