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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4ffec7b5993ab0f9631246b861e9a12c91d462b8a062d7eaf5b0bdfe0f13cf' 
  AND token = 'eumFVTrsNKxueJp/DobGA104SaVIU7mhNSHXio+ogPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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