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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b324a918fd4d06dd0018236ce788a7f844a588835c99ebd6c9bef9fc58106046' 
  AND token = 'lQ7VKK8Kc85J/0qtJOPhMaeM6bQAGMhfTSKg6DBNzZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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