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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbb9669df23f5e59e21d435d6ce901f58e1155d00c1101d2a4e29b19c6a6d4f' 
  AND token = 'ER3vuD7/zrHvDacWPUxMdbeGjHihNfsyhUVzmx/g8oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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