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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf52a6366c805820b08b7b3f795b30c258483d659b09c6b7a676b4c1feaab41' 
  AND token = 'LAwS67ToHr3FcFDaa3DAm2m65zhmVLJmhfwcCkDUM7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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