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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3cd8ac3c042b215416841197ec7188aa7e63173c28f40f789f6e749dd20904' 
  AND token = 'RMFI7qAeM8z55COUGz6uxk/SkEDMllotxRJGKvoFCRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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