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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6474c14b6c361eb4c0e6fe84258a0ae3b64aa7438a5e811055066cd09e9e9ff' 
  AND token = 'WAGCstMavaAF0IZrpQLasy4Hw699mKvTkn1QV+yxFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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