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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28e2b4ad1edfa61e8f955e1f14c311fe6778829c84bf15e05159bc389c45ae7' 
  AND token = 'Xqf9Wgos85imEXmiOi3sFiAgm6riVugvGEHW2T/1bq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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