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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cf71b43e7192795bb15400f0077d989f2f295777c861b8ceea47e6b877d1bf' 
  AND token = '2ERUYBt4ktUvfXYdkPS0FM52M/MoGRSEhMk3SMeIffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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