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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983d06709ea92a640c88acda13ae63a1cf4d9132d90d1755918af98a5fd90541' 
  AND token = 'Gv9CAGUhvVH1ePVmM/SHbyoR5KkswEVki/FdfSz36P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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