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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819eb814c13ca25bb1e91d5636ca0b78bad5c2134d1ca1d84ff9df917ba8fc4e' 
  AND token = '1dbS2c0lJWxIgztz7ZKuL3p4+XlKzF6v/rr79DldX24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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