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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9c659f37496008eb0c4a6bc8a3d60fd27780197ecf0b1e9d140b49bd3751ef' 
  AND token = 's0icTVaGL+O7CHc5B5yLuhlySEOGUXG0idlLkqHpHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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