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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c86cd6ca1fca531074bf9acad7de5fd7bde303e66c61be4c234e87ce09e5116' 
  AND token = 'wwIlkaI2L5RJXMKnN88ADzgz7851hqRFVMGfeoGJsAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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