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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031356b25298b9dd0f1c09f171c00906793353b5dc2754706dfcd76a92ccb413' 
  AND token = 'DcKByNMnN+UdFhrhdhSoniz+0Jl5r6KKLZPoVXvc6bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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