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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd965d6110e443a8c7e84bd19afbcee94ef22236c2d866187a49210d6865f5fbc' 
  AND token = 'KhruFj26tSNNtbbkjeliZ0ZzcVQ2eHu3+PE8DvQTv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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