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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9b93c04e2328fef7372e9b865f05667bee3dbaed24713da647a454be9dd0ec' 
  AND token = 'O7PXmfk8ZGlqM0f9uUVIp4qAaTfyTR5e5vbCSsOsTy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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