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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e82d2bc919bc2473a2b8fc8676274414dcb2e04f569ed73fbc917a024e4cc4' 
  AND token = 'nsFkpxaxoaWJXo/+l4FVMtc50tJTDoRtZCL0yMKvP5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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