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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33b28a3739d95da2bb3dff23cd8c49fb2c33e89d64367a52f4f5465fc5b5cdc' 
  AND token = 'kW3BZO0uAM1CnIArY1lIGDNyRu+FH9ctgDDfREt/rL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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