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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9c9130f8b86de23ec872e057b35289d9d8ee3d9de483037664ed203a1f3c5c' 
  AND token = 'm/9COSVr/rJSaFnt33vsDAe9I9nhr43F64U50W2I6lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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