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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70a2e3f7a9df2b46f68618125776028fce3bcaf551976d5f41506436021da5f' 
  AND token = 'uES1/HLbiEaLXP78qPiUFctXb9UogaHA40zjVFk/RvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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