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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07db41595264c23ea678c861286b9e354c9d9dc4a3d5d4bfad11eafb76f5dc9a' 
  AND token = 'MPyAJFh+aULFvpd6rVTG31BfknoPmLC2MdeW5FGR/G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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