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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9fa20a899b3d60c3083b0ca0a53771f757109e28dd94fd9b69ad2e23a1bae7' 
  AND token = '/pEdgZ9ZJIvpH5OLrmIztaadk5KaDSwCjafhpoP+Gxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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