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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bcdf81bed4db410e0bb32c8d07c931f698e3afa8b461a888e8146c6e9e21d6' 
  AND token = 'yCblxbA582tp23vNyisAd041nTVmbfMInU8GM+tapW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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