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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72bd8a947ec58ede4420cd5128d8afc7a286b0c5cfb3821545d88c780488a2a' 
  AND token = 'UoDqKYzXbPJR7y+kEw/Qk6AZmlblonkebOes9tPNIjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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