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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcada6f4450d42040ef8bf01adad0a6c3d1da68cfd4103caf39acb44a943be5' 
  AND token = 'ML6sVGI8zC1IGwNsw7UbRBexr7ek93hzfg9+SVWpfDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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