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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0615132f058af68099f94b003dc3a044f63932212757f7ee9baf0f6b4ee63520' 
  AND token = 'TRNxxJBItrXlCUCiT/gO0SQNQaQeUaD8kH/3CRE0bzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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