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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e527d46912f354420f583821de3935c5a11d8d568538b232accd3af903d00b1' 
  AND token = 'JYVsUSy9y6EtWVMEosEBcZ/cyyjlEEdccT/l9fIkhVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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