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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc50364f1f370b9bcc37f59d003fce31234a2466d1b37557dbdd1cc67e0a190' 
  AND token = '/6wsk2MpfnAekBiTJVkjV4R2/McHoZzbiQ0m39xWO0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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