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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e869b758e0e513a35d3e54e1dedfc0aa24ab26b681ce54a14e50f5fca745ed9b' 
  AND token = 'hz1Gr0mjuC4SSFEoTnIQzAOU3Ox215RUpmv8tIhZ8Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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