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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2874a87969d63731a4e481fd233a82b08489d7802283616209de091b0e426353' 
  AND token = 'hmc/n0C02S+H8euh7FpWVE2/c2pXs2k8aXHS+8ZJJaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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