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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd621a4339efc320cb6ea50bffd08a5a5d6eb6ef878f48f847431210c77ad0955' 
  AND token = 'IG7mtQ1OPeNzDLEnQRN+CLcnUnqix1e5JYHuMe82LqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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