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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b799a7cc8ee5e1ce9ac62f19338b3ea520b95ec9bec2eae9731d4fc5e482aa68' 
  AND token = 'fVMKHYjgxldCuKVGHE2tI7lyd13cXvSVq+vDjvstgi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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