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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027c0c1e854b31a38970974c6e2446a153e698c56de444548eb8d5d3d4df0255' 
  AND token = 'BLnSd0228QDNEtTMa1kryPRu+ZanRwU/NVit0j0rrjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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