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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fffe51f29ffa48f149745311d627e67698da67332b604e64f0e793b4e9a0d3' 
  AND token = '0cYHvlUJupB2eTBtfQ1kFZvc+MhkrRoO2l8y9iuVt4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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