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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107745318069d50531cabd4fbfbf9fcf08b84e7d82f460aaac25fccac1c3ecb2' 
  AND token = 'iyRfSh9D9R/Kf/GSeCnTLF/PM0pcOqER2RRx0tdb2mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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