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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ab3fa1d82bf3bb2a6ae91a66c121050f414753e7229a5b8b3fbcfddbacee2b' 
  AND token = 'sK3aHCf/rqr7OOx5+Vuc198ousu19tFrIBJ+5c9PpX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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