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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb315df6103b7dec8389a8b130163bfcdc1a3e8ec11505dbda90d6d1f6f3dee9' 
  AND token = '2LJ7lhy/mo09InuiQXtQN1UwrbFIoV6LCEMHpjcUiiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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