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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308948ce67cfa26ac63d14dba9e12880d87bb7deae4e1088e2f1ed14391e638b' 
  AND token = '9ZhZN1G8GG5o9NTL79hq5Seu5gdY2cqbXaEEcTQ2yzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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