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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d4c39dc66f6493e2ae8123486a66a11856880548257d5634191a349e8374e5' 
  AND token = '/0JshkgqHfONb0EZCcU9emBHvd/MIWUf2AO2K9Drc/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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