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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7148347587420a494a2c4e9e3966b0b8361f37fba6b742495c4bf0f94397ba' 
  AND token = 'ET99ZMetCi+rzLLoF9jgFL9QHE08/FiFGq5KH4N60m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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